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Flexible positive electrode material applied to lithium-sulfur battery and preparation method of flexible positive electrode material

A cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, positive electrodes, etc., can solve the problems of low utilization rate of active materials, poor performance of lithium-sulfur batteries, etc. Smooth and effective effect of surface energy, charge and discharge energy

Active Publication Date: 2021-03-09
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of flexible cathode material and its preparation method that is applied to lithium-sulfur battery in view of the above-mentioned existing defect, and described flexible cathode material has NiSe 2 -CoSe 2 The flexible and self-supporting heterostructure can effectively improve the polysulfide shuttle effect in the lithium-sulfur battery existing in the prior art; the low utilization rate of the active material in the positive electrode material and the poor performance of the lithium-sulfur battery caused by the lithium dendrite phenomenon

Method used

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  • Flexible positive electrode material applied to lithium-sulfur battery and preparation method of flexible positive electrode material

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Embodiment 1

[0026] The flexible cathode material applied to lithium-sulfur batteries is S / NiSe 2 -CoSe 2 @PCNFs composites.

[0027] The preparation method of the flexible cathode material applied to the lithium-sulfur battery comprises the following steps:

[0028] (1) Preparation of electrospinning precursor solution: under magnetic stirring, add polymethyl methacrylate, cobalt acetate and polyacrylonitrile to 15 g of N,N-dimethylformamide solution with a mass fraction of 75%. and multi-walled carbon nanofibers, wherein the mixture is added in an amount of 10% of the mass of N,N-dimethylformamide solution; by mass ratio polymethyl methacrylate: cobalt acetate: polyacrylonitrile: multi-walled carbon nanofibers The fiber ratio is 1:0.5:1:0.01; heat and stir at a constant temperature of 75°C for 2 hours to obtain a mixed solution;

[0029] (2) Preparation of nano-PCNFs / Co spinning sheet: Add the mixed solution obtained in step (1) into the syringe for electrospinning, control the workin...

Embodiment 2

[0040] The preparation method of the flexible cathode material applied to the lithium-sulfur battery comprises the following steps:

[0041] (1) Preparation of electrospinning precursor solution: under magnetic stirring, add polymethyl methacrylate, cobalt acetate and polyacrylonitrile to 13 g of N,N-dimethylformamide solution with a mass fraction of 65%. and multi-walled carbon nanofibers, wherein the mixture is added in an amount of 11% of the mass of N,N-dimethylformamide solution; by mass ratio polymethyl methacrylate: cobalt acetate: polyacrylonitrile: multi-walled carbon nanofibers The fiber ratio is 1:1.5:2:0.2; heat and stir at a constant temperature of 75°C for 2 hours to obtain a mixed solution;

[0042] (2) Preparation of nano-PCNFs / Co spinning sheets: Add the mixed solution obtained in step (1) into the syringe for electrospinning, control the working voltage to 13kV, adjust the distance between the receiver and the spinning needle to be 15cm, and the outflow speed...

Embodiment 3

[0048] The method for preparing a flexible positive electrode material applied to a lithium-sulfur battery comprises the following steps:

[0049] (1) Preparation of electrospinning precursor solution: under magnetic stirring, add polymethyl methacrylate, cobalt acetate and polyacrylonitrile to 18 g of N,N-dimethylformamide solution with a mass fraction of 90%. The mixture and multi-walled carbon nanofibers, wherein the mixture is added in an amount of 10% to 30% of the mass of the N,N-dimethylformamide solution; according to the mass ratio of polymethyl methacrylate: cobalt acetate: polyacrylonitrile: more The ratio of wall carbon nanofibers is 1:3:3:0.1; heated and stirred at a constant temperature of 75°C for 2 hours to obtain a mixed solution;

[0050] (2) Preparation of nano-PCNFs / Co spinning sheet: Add the mixed solution obtained in step (1) into the syringe for electrospinning, control the working voltage to 20kV, adjust the distance between the receiver and the spinnin...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a flexible positive electrode material applied to a lithium-sulfur battery and a preparation method of the flexible positive electrode material. The flexible positive electrode material is an S / NiSe2-CoSe2@PCNFs composite material. The flexible positive electrode material has flexible self-supportof a NiSe2-CoSe2 heterostructure, so that the shuttle effect of polysulfide in a lithium-sulfur battery in the prior art can be effectively improved; and the defects of low utilization rate of activesubstances in the positive electrode material and poor performance of the lithium-sulfur battery caused by a lithium dendritic crystal phenomenon are overcome.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a flexible positive electrode material applied to lithium-sulfur batteries and a preparation method thereof. Background technique [0002] As a secondary battery, lithium-sulfur batteries can be charged by applying an external current to the battery, and this type of rechargeable battery has a wide range of potential applications. Important considerations when developing lithium-sulfur secondary batteries include mass energy, cycle life, and ease of battery assembly. [0003] With a theoretical discharge capacity of 1675mAh / g and a theoretical energy density of 2600Wh / kg, the lithium-sulfur battery is the most promising battery currently under development, and its theoretical energy density is much higher than that of other battery systems studied so far Density (Ni-MH battery: 450Wh / kg, Li-FeS battery: 480Wh / kg, Li-MnO2 battery: 1000 / Wh / kg, and Na-S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/052
CPCH01M4/38H01M4/625H01M4/624H01M4/628H01M10/052H01M2004/028Y02E60/10
Inventor 王新何宗珂
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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